[ViewVC] Diff of: cvs/gvpe/src/vpn.C

Comparing gvpe/src/vpn.C (file contents):
Revision 1.4 by pcg, Fri Apr 4 05:26:45 2003 UTC vs.
Revision 1.31 by pcg, Sat Mar 5 19:13:16 2005 UTC

…		…
1	/*	1	/*
2	vpn.C -- handle the protocol, encryption, handshaking etc.	2	vpn.C -- handle the protocol, encryption, handshaking etc.
		3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.	15	GNU General Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	#include <list>	24	#include <list>
22		25
		26	#include <cstdio>
		27	#include <cstring>
23	#include <cstdlib>	28	#include <cstdlib>
24	#include <cstring>
25	#include <cstdio>
26		29
27	#include <sys/types.h>	30	#include <sys/types.h>
28	#include <sys/socket.h>	31	#include <sys/socket.h>
29	#include <sys/poll.h>
30	#include <sys/wait.h>	32	#include <sys/wait.h>
31	#include <netinet/in.h>
32	#include <arpa/inet.h>
33	#include <errno.h>	33	#include <errno.h>
34	#include <time.h>	34	#include <time.h>
35	#include <unistd.h>	35	#include <unistd.h>
		36	#include <fcntl.h>
		37	#include <sys/socket.h>
		38
		39	#include "netcompat.h"
36		40
37	#include "pidfile.h"	41	#include "pidfile.h"
38		42
39	#include "connection.h"	43	#include "connection.h"
40	#include "util.h"	44	#include "util.h"
41	#include "vpn.h"	45	#include "vpn.h"
42		46
43	#if ENABLE_TCP	47	vpn network; // THE vpn (bad design...)
44	# include <map>
45	# include <unistd.h>
46	# include <fcntl.h>
47	# include <sys/poll.h>
48	#endif
49		48
50	/////////////////////////////////////////////////////////////////////////////	49	/////////////////////////////////////////////////////////////////////////////
51		50
52	const char *vpn::script_if_up ()	51	const char *vpn::script_if_up ()
53	{	52	{
57	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion	56	mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion
58	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round	57	mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round
59	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again	58	mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again
60		59
61	char *env;	60	char *env;
62	asprintf (&env, "CONFBASE=%s", confbase);	61	asprintf (&env, "CONFBASE=%s", confbase); putenv (env);
63	putenv (env);
64	asprintf (&env, "NODENAME=%s", THISNODE->nodename);	62	asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env);
65	putenv (env);
66	asprintf (&env, "NODEID=%d", THISNODE->id);	63	asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env);
67	putenv (env);
68	asprintf (&env, "IFNAME=%s", tap->interface ());	64	asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env);
69	putenv (env);	65	asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env);
		66	asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env);
70	asprintf (&env, "MTU=%d", mtu);	67	asprintf (&env, "MTU=%d", mtu); putenv (env);
71	putenv (env);
72	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",	68	asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x",
73	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,	69	0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8,
74	THISNODE->id & 0xff);	70	THISNODE->id & 0xff);
75	putenv (env);	71	putenv (env);
76		72
…		…
78	}	74	}
79		75
80	int	76	int
81	vpn::setup ()	77	vpn::setup ()
82	{	78	{
		79	ipv4_fd = -1;
		80
		81	if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto)
		82	{
		83	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);
		84
		85	if (ipv4_fd < 0)
		86	return -1;
		87
		88	fcntl (ipv4_fd, F_SETFL, O_NONBLOCK);
		89
		90	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
		91	// this I really consider a linux bug. I am neither connected
		92	// nor do I fragment myself. Linux still sets DF and doesn't
		93	// fragment for me sometimes.
		94	{
		95	int oval = IP_PMTUDISC_DONT;
		96	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
		97	}
		98	#endif
		99
		100	sockinfo si (THISNODE, PROT_IPv4);
		101
		102	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))
		103	{
		104	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));
		105	exit (EXIT_FAILURE);
		106	}
		107
		108	ipv4_ev_watcher.start (ipv4_fd, EVENT_READ);
		109	}
		110
83	udpv4_fd = -1;	111	udpv4_fd = -1;
84		112
85	if (THISNODE->protocols & PROT_UDPv4)	113	if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port)
86	{	114	{
87	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);	115	udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
88		116
89	if (udpv4_fd < 0)	117	if (udpv4_fd < 0)
90	return -1;	118	return -1;
		119
		120	fcntl (udpv4_fd, F_SETFL, O_NONBLOCK);
91		121
92	// standard daemon practise...	122	// standard daemon practise...
93	{	123	{
94	int oval = 1;	124	int oval = 1;
95	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	125	setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
96	}	126	}
97		127
98	sockinfo si (THISNODE, PROT_UDPv4);	128	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
99
100	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
101	{
102	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
103	exit (1);
104	}
105
106	#ifdef IP_MTU_DISCOVER
107	// this I really consider a linux bug. I am neither connected	129	// this I really consider a linux bug. I am neither connected
108	// nor do I fragment myself. Linux still sets DF and doesn't	130	// nor do I fragment myself. Linux still sets DF and doesn't
109	// fragment for me sometimes.	131	// fragment for me sometimes.
110	{	132	{
111	int oval = IP_PMTUDISC_DONT;	133	int oval = IP_PMTUDISC_DONT;
112	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	134	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
113	}	135	}
114	#endif	136	#endif
115		137
		138	sockinfo si (THISNODE, PROT_UDPv4);
		139
		140	if (bind (udpv4_fd, si.sav4 (), si.salenv4 ()))
		141	{
		142	slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno));
		143	exit (EXIT_FAILURE);
		144	}
		145
116	udpv4_ev_watcher.start (udpv4_fd, POLLIN);	146	udpv4_ev_watcher.start (udpv4_fd, EVENT_READ);
117	}	147	}
118		148
119	ipv4_fd = -1;	149	icmpv4_fd = -1;
		150
		151	#if ENABLE_ICMP
120	if (THISNODE->protocols & PROT_IPv4)	152	if (THISNODE->protocols & PROT_ICMPv4)
121	{	153	{
122	ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto);	154	icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP);
123		155
124	if (ipv4_fd < 0)	156	if (icmpv4_fd < 0)
125	return -1;	157	return -1;
126		158
127	sockinfo si (THISNODE, PROT_IPv4);	159	fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK);
128		160
129	if (bind (ipv4_fd, si.sav4 (), si.salenv4 ()))	161	#ifdef ICMP_FILTER
130	{	162	{
131	slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno));	163	icmp_filter oval;
132	exit (1);	164	oval.data = 0xffffffff;
		165	if (::conf.icmp_type < 32)
		166	oval.data &= ~(1 << ::conf.icmp_type);
		167
		168	setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
133	}	169	}
		170	#endif
134		171
135	#ifdef IP_MTU_DISCOVER	172	#if defined(SOL_IP) && defined(IP_MTU_DISCOVER)
136	// this I really consider a linux bug. I am neither connected	173	// this I really consider a linux bug. I am neither connected
137	// nor do I fragment myself. Linux still sets DF and doesn't	174	// nor do I fragment myself. Linux still sets DF and doesn't
138	// fragment for me sometimes.	175	// fragment for me sometimes.
139	{	176	{
140	int oval = IP_PMTUDISC_DONT;	177	int oval = IP_PMTUDISC_DONT;
141	setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);	178	setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval);
142	}	179	}
143	#endif	180	#endif
144		181
		182	sockinfo si (THISNODE, PROT_ICMPv4);
		183
		184	if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ()))
		185	{
		186	slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno));
		187	exit (EXIT_FAILURE);
		188	}
		189
145	ipv4_ev_watcher.start (ipv4_fd, POLLIN);	190	icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ);
146	}	191	}
		192	#endif
		193
		194	tcpv4_fd = -1;
147		195
148	#if ENABLE_TCP	196	#if ENABLE_TCP
149	if (THISNODE->protocols & PROT_TCPv4)	197	if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port)
150	{	198	{
151	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);	199	tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
152		200
153	if (tcpv4_fd < 0)	201	if (tcpv4_fd < 0)
154	return -1;	202	return -1;
		203
		204	fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK);
155		205
156	// standard daemon practise...	206	// standard daemon practise...
157	{	207	{
158	int oval = 1;	208	int oval = 1;
159	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);	209	setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
…		…
162	sockinfo si (THISNODE, PROT_TCPv4);	212	sockinfo si (THISNODE, PROT_TCPv4);
163		213
164	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))	214	if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ()))
165	{	215	{
166	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));	216	slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno));
167	exit (1);	217	exit (EXIT_FAILURE);
168	}	218	}
169		219
170	if (listen (tcpv4_fd, 5))	220	if (listen (tcpv4_fd, 5))
171	{	221	{
172	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));	222	slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno));
173	exit (1);	223	exit (EXIT_FAILURE);
		224	}
		225
		226	tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ);
		227	}
		228	#endif
		229
		230	#if ENABLE_DNS
		231	if (THISNODE->protocols & PROT_DNSv4)
		232	{
		233	dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4);
		234
		235	dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
		236
		237	if (dnsv4_fd < 0)
		238	return -1;
		239
		240	// standard daemon practise...
		241	{
		242	int oval = 1;
		243	setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval);
		244	}
		245
		246	sockinfo si (THISNODE->dns_hostname,
		247	THISNODE->dns_hostname ? THISNODE->dns_port : 0,
		248	PROT_DNSv4);
		249
		250	if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ()))
174	}	251	{
		252	slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno));
		253	exit (EXIT_FAILURE);
		254	}
175		255
176	tcpv4_ev_watcher.start (tcpv4_fd, POLLIN);	256	dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ);
177	}	257	}
178	#endif	258	#endif
179		259
180	tap = new tap_device ();	260	tap = new tap_device ();
181	if (!tap) //D this, of course, never catches	261	if (!tap) //D this, of course, never catches
182	{	262	{
183	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);	263	slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname);
184	exit (1);	264	exit (EXIT_FAILURE);
185	}	265	}
186		266
187	run_script (run_script_cb (this, &vpn::script_if_up), true);	267	run_script (run_script_cb (this, &vpn::script_if_up), true);
188		268
189	tap_ev_watcher.start (tap->fd, POLLIN);	269	tap_ev_watcher.start (tap->fd, EVENT_READ);
190		270
191	reconnect_all ();	271	reconnect_all ();
192		272
193	return 0;	273	return 0;
194	}	274	}
195		275
196	void	276	bool
197	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	277	vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
198	{	278	{
		279	#if defined(SOL_IP) && defined(IP_TOS)
199	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	280	setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		281	#endif
200	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	282	sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
201	}
202		283
203	void	284	return true;
		285	}
		286
		287	static u16
		288	ipv4_checksum (u16 *data, unsigned int len)
		289	{
		290	// use 32 bit accumulator and fold back carry bits at the end
		291	u32 sum = 0;
		292
		293	while (len > 1)
		294	{
		295	sum += *data++;
		296	len -= 2;
		297	}
		298
		299	// odd byte left?
		300	if (len)
		301	sum += (u8 )data;
		302
		303	// add back carry bits
		304	sum = (sum >> 16) + (sum & 0xffff); // lo += hi
		305	sum += (sum >> 16); // carry
		306
		307	return ~sum;
		308	}
		309
		310	#if ENABLE_ICMP
		311	bool
		312	vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		313	{
		314	#if defined(SOL_IP) && defined(IP_TOS)
		315	setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		316	#endif
		317
		318	pkt->unshift_hdr (4);
		319
		320	icmp_header hdr = (icmp_header )&((*pkt)[0]);
		321	hdr->type = ::conf.icmp_type;
		322	hdr->code = 255;
		323	hdr->checksum = 0;
		324	hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len);
		325
		326	sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		327
		328	return true;
		329	}
		330	#endif
		331
		332	bool
204	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)	333	vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
205	{	334	{
		335	#if defined(SOL_IP) && defined(IP_TOS)
206	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);	336	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
		337	#endif
207	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());	338	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
		339
		340	return true;
		341	}
		342
		343	void
		344	vpn::inject_data_packet (tap_packet *pkt, int dst)
		345	{
		346	if (dst)
		347	{
		348	// unicast
		349	if (dst != THISNODE->id)
		350	conns[dst - 1]->inject_data_packet (pkt);
		351	}
		352	else
		353	{
		354	// broadcast, this is ugly, but due to the security policy
		355	// we have to connect to all hosts...
		356	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
		357	if ((*c)->conf != THISNODE)
		358	(*c)->inject_data_packet (pkt, true);
		359	}
208	}	360	}
209		361
210	void	362	void
211	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	363	vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
212	{	364	{
…		…
219	if (src == 0 \|\| src > conns.size ()	371	if (src == 0 \|\| src > conns.size ()
220	\|\| dst > conns.size ()	372	\|\| dst > conns.size ()
221	\|\| pkt->typ () >= vpn_packet::PT_MAX)	373	\|\| pkt->typ () >= vpn_packet::PT_MAX)
222	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),	374	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
223	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());	375	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
		376	else if (dst > conns.size ())
		377	slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"),
		378	(const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ());
224	else	379	else
225	{	380	{
226	connection *c = conns[src - 1];	381	connection *c = conns[src - 1];
227		382
228	if (dst == 0 && !THISNODE->routerprio)	383	if (dst == 0)
229	slog (L_WARN, _("%s(%s): received broadcast, but we are no router"),	384	slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"),
230	c->conf->nodename, (const char *)rsi);	385	c->conf->nodename, (const char *)rsi);
231	else if (dst != 0 && dst != THISNODE->id)	386	else if (dst != THISNODE->id)
232	// FORWARDING NEEDED ;)	387	{
		388	if (THISNODE->routerprio)
		389	// the tos setting gets lost here. who cares.
		390	conns[dst - 1]->inject_vpn_packet (pkt);
		391	else
233	slog (L_WARN,	392	slog (L_WARN,
234	_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"),	393	_("%s(%s): forwarding request (=> %s), but we are no router"),
		394	c->conf->nodename, (const char *)rsi,
235	dst, conns[dst - 1]->conf->nodename,	395	conns[dst - 1]->conf->nodename);
236	(const char *)rsi,	396	}
237	THISNODE->id, THISNODE->nodename);
238	else	397	else
239	c->recv_vpn_packet (pkt, rsi);	398	c->recv_vpn_packet (pkt, rsi);
240	}	399	}
241	}	400	}
242		401
		402	bool
		403	vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		404	{
		405	switch (si.prot)
		406	{
		407	case PROT_IPv4:
		408	return send_ipv4_packet (pkt, si, tos);
		409	case PROT_UDPv4:
		410	return send_udpv4_packet (pkt, si, tos);
		411	#if ENABLE_TCP
		412	case PROT_TCPv4:
		413	return send_tcpv4_packet (pkt, si, tos);
		414	#endif
		415	#if ENABLE_ICMP
		416	case PROT_ICMPv4:
		417	return send_icmpv4_packet (pkt, si, tos);
		418	#endif
		419	#if ENABLE_DNS
		420	case PROT_DNSv4:
		421	return send_dnsv4_packet (pkt, si, tos);
		422	#endif
		423
		424	default:
		425	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		426	}
		427
		428	return false;
		429	}
		430
243	void	431	void
244	vpn::udpv4_ev (io_watcher &w, short revents)	432	vpn::ipv4_ev (io_watcher &w, short revents)
245	{	433	{
246	if (revents & (POLLIN \| POLLERR))	434	if (revents & EVENT_READ)
247	{	435	{
248	vpn_packet *pkt = new vpn_packet;	436	vpn_packet *pkt = new vpn_packet;
249	struct sockaddr_in sa;	437	struct sockaddr_in sa;
250	socklen_t sa_len = sizeof (sa);	438	socklen_t sa_len = sizeof (sa);
251	int len;	439	int len;
252		440
253	len = recvfrom (w.p->fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	441	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
254		442
255	sockinfo si(sa);	443	sockinfo si(sa, PROT_IPv4);
256		444
257	if (len > 0)	445	if (len > 0)
258	{	446	{
259	pkt->len = len;	447	pkt->len = len;
		448
		449	// raw sockets deliver the ipv4 header, but don't expect it on sends
		450	pkt->skip_hdr (IP_OVERHEAD);
260		451
261	recv_vpn_packet (pkt, si);	452	recv_vpn_packet (pkt, si);
262	}	453	}
263	else	454	else
264	{	455	{
…		…
266	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	457	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
267	}	458	}
268		459
269	delete pkt;	460	delete pkt;
270	}	461	}
271	else if (revents & POLLHUP)
272	{
273	// this cannot ;) happen on udp sockets
274	slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating."));
275	exit (1);
276	}
277	else	462	else
278	{	463	{
279	slog (L_ERR,	464	slog (L_ERR,
280	_("FATAL: unknown revents %08x in socket, terminating\n"),	465	_("FATAL: unknown revents %08x in socket, terminating\n"),
281	revents);	466	revents);
282	exit (1);	467	exit (EXIT_FAILURE);
283	}	468	}
284	}	469	}
285		470
		471	#if ENABLE_ICMP
286	void	472	void
287	vpn::ipv4_ev (io_watcher &w, short revents)	473	vpn::icmpv4_ev (io_watcher &w, short revents)
288	{	474	{
289	if (revents & (POLLIN \| POLLERR))	475	if (revents & EVENT_READ)
290	{	476	{
291	vpn_packet *pkt = new vpn_packet;	477	vpn_packet *pkt = new vpn_packet;
292	struct sockaddr_in sa;	478	struct sockaddr_in sa;
293	socklen_t sa_len = sizeof (sa);	479	socklen_t sa_len = sizeof (sa);
294	int len;	480	int len;
295		481
296	len = recvfrom (w.p->fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);	482	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
297		483
298	sockinfo si(sa, PROT_IPv4);	484	sockinfo si(sa, PROT_ICMPv4);
299		485
300	if (len > 0)	486	if (len > 0)
301	{	487	{
302	pkt->len = len;	488	pkt->len = len;
303		489
		490	icmp_header hdr = (icmp_header )&((*pkt)[IP_OVERHEAD]);
		491
		492	if (hdr->type == ::conf.icmp_type
		493	&& hdr->code == 255)
		494	{
304	// raw sockets deliver the ipv4, but don't expect it on sends	495	// raw sockets deliver the ipv4, but don't expect it on sends
305	// this is slow, but...	496	// this is slow, but...
306	pkt->skip_hdr (IP_OVERHEAD);	497	pkt->skip_hdr (ICMP_OVERHEAD);
307		498
308	recv_vpn_packet (pkt, si);	499	recv_vpn_packet (pkt, si);
		500	}
309	}	501	}
310	else	502	else
311	{	503	{
312	// probably ECONNRESET or somesuch	504	// probably ECONNRESET or somesuch
313	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));	505	slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno));
314	}	506	}
315		507
316	delete pkt;	508	delete pkt;
317	}
318	else if (revents & POLLHUP)
319	{
320	// this cannot ;) happen on udp sockets
321	slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating."));
322	exit (1);
323	}	509	}
324	else	510	else
325	{	511	{
326	slog (L_ERR,	512	slog (L_ERR,
327	_("FATAL: unknown revents %08x in socket, terminating\n"),	513	_("FATAL: unknown revents %08x in socket, terminating\n"),
328	revents);	514	revents);
329	exit (1);	515	exit (EXIT_FAILURE);
330	}
331	}
332
333	#if ENABLE_TCP
334
335	struct tcp_connection;
336
337	struct lt_sockinfo
338	{
339	bool operator()(const sockinfo a, const sockinfo b) const
340	{
341	return a < b;
342	}
343	};
344
345	struct tcp_si_map : public map<const sockinfo , tcp_connection , lt_sockinfo> {
346	void cleaner_cb (time_watcher &w); time_watcher cleaner;
347
348	tcp_si_map ()
349	: cleaner(this, &tcp_si_map::cleaner_cb)
350	{
351	cleaner.start (0);
352	}
353	} tcp_si;
354
355	struct tcp_connection : io_watcher {
356	tstamp last_activity;
357	const sockinfo si;
358	vpn &v;
359	bool ok;
360
361	vpn_packet *r_pkt;
362	u32 r_len, r_ofs;
363
364	void tcpv4_ev (io_watcher &w, short revents);
365
366	operator tcp_si_map::value_type()
367	{
368	return tcp_si_map::value_type (&si, this);
369	}
370
371	tcp_connection (int fd, const sockinfo &si_, vpn &v_)
372	: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev)
373	{
374	last_activity = NOW;
375	ok = false;
376	r_pkt = 0;
377	start (fd, POLLOUT);
378	}
379
380	~tcp_connection () { if (p) close (p->fd); }
381	};
382
383	void tcp_si_map::cleaner_cb (time_watcher &w)
384	{
385	w.at = NOW + 600;
386	tstamp to = NOW - ::conf.keepalive - 30;
387
388	for (iterator i = begin (); i != end(); )
389	if (i->second->last_activity >= to)
390	++i;
391	else
392	{
393	erase (i);
394	i = begin ();
395	}	516	}
396	}	517	}
397
398	void
399	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
400	{
401	tcp_si_map::iterator info = tcp_si.find (&si);
402
403	if (info == tcp_si.end ())
404	{
405	// woaw, the first lost packet ;)
406	int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
407
408	if (fd >= 0)
409	{
410	fcntl (fd, F_SETFL, O_NONBLOCK);
411
412	if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0
413	\|\| errno == EINPROGRESS)
414	{
415	tcp_connection i = new tcp_connection (fd, si, this);
416
417	tcp_si.insert (*i);
418	}
419	else
420	close (fd);
421	}
422	}
423	else
424	{
425	tcp_connection *i = info->second;
426
427	i->last_activity = NOW;
428
429	if (i->ok)
430	{
431	setsockopt (i->p->fd, SOL_IP, IP_TOS, &tos, sizeof tos);
432
433	// we use none of the advantages of tcp
434	write (i->p->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32);
435	}
436	}
437
438	#if 0
439	setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos);
440	sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ());
441	#endif	518	#endif
442	}
443		519
444	void	520	void
445	tcp_connection::tcpv4_ev (io_watcher &w, short revents)
446	{
447	last_activity = NOW;
448
449	if (!ok) // just established?
450	{
451	ok = true;
452	set (POLLIN);
453	}
454
455	if (revents & (POLLIN \| POLLERR))
456	{
457	u32 len;
458
459	if (sizeof (len) == read (p->fd, &len, sizeof (len)))
460	{
461	vpn_packet *pkt = new vpn_packet;
462
463	if (len == read (p->fd, &((*pkt)[0]), len))
464	{
465	pkt->len = len;
466
467	v.recv_vpn_packet (pkt, si);
468	return;
469	}
470
471	delete pkt;
472	}
473
474	tcp_si.erase (&si);
475
476	set (0);//D
477	}
478	}
479
480	void
481	vpn::tcpv4_ev (io_watcher &w, short revents)	521	vpn::udpv4_ev (io_watcher &w, short revents)
482	{	522	{
483	if (revents & (POLLIN \| POLLERR))	523	if (revents & EVENT_READ)
484	{	524	{
		525	vpn_packet *pkt = new vpn_packet;
485	struct sockaddr_in sa;	526	struct sockaddr_in sa;
486	socklen_t sa_len = sizeof (sa);	527	socklen_t sa_len = sizeof (sa);
487	int len;	528	int len;
488		529
489	int fd = accept (w.p->fd, (sockaddr *)&sa, &sa_len);	530	len = recvfrom (w.fd, &((pkt)[0]), MAXSIZE, 0, (sockaddr )&sa, &sa_len);
490		531
491	if (fd >= 0)
492	{
493	fcntl (fd, F_SETFL, O_NONBLOCK);
494
495	sockinfo si(sa, PROT_TCPv4);	532	sockinfo si(sa, PROT_UDPv4);
496	tcp_connection i = new tcp_connection (fd, si, this);
497		533
498	slog (L_DEBUG, _("accepted tcp connection from %s\n"), (const char *)si);//D	534	if (len > 0)
499
500	tcp_si.insert (*i);
501	}	535	{
		536	pkt->len = len;
		537
		538	recv_vpn_packet (pkt, si);
		539	}
		540	else
		541	{
		542	// probably ECONNRESET or somesuch
		543	slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno));
		544	}
		545
		546	delete pkt;
		547	}
		548	else
502	}	549	{
		550	slog (L_ERR,
		551	_("FATAL: unknown revents %08x in socket, terminating\n"),
		552	revents);
		553	exit (EXIT_FAILURE);
		554	}
503	}	555	}
504
505	#endif
506		556
507	void	557	void
508	vpn::tap_ev (io_watcher &w, short revents)	558	vpn::tap_ev (io_watcher &w, short revents)
509	{	559	{
510	if (revents & POLLIN)	560	if (revents & EVENT_READ)
511	{	561	{
512	/* process data */	562	/* process data */
513	tap_packet *pkt;	563	tap_packet *pkt;
514		564
515	pkt = tap->recv ();	565	pkt = tap->recv ();
516		566
		567	if (!pkt)
		568	return;
		569
		570	if (pkt->len > 14)
		571	{
517	int dst = mac2id (pkt->dst);	572	int dst = mac2id (pkt->dst);
518	int src = mac2id (pkt->src);	573	int src = mac2id (pkt->src);
519		574
520	if (src != THISNODE->id)	575	if (src != THISNODE->id)
521	{
522	slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating."));
523	exit (1);
524	}
525
526	if (dst == THISNODE->id)
527	{
528	slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating."));
529	exit (1);
530	}
531
532	if (dst > conns.size ())
533	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
534	else
535	{
536	if (dst)
537	{	576	{
538	// unicast	577	slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting."));
539	if (dst != THISNODE->id)	578	exit (EXIT_FAILURE);
540	conns[dst - 1]->inject_data_packet (pkt);
541	}	579	}
		580
		581	if (dst == THISNODE->id)
		582	{
		583	slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting."));
		584	exit (EXIT_FAILURE);
		585	}
		586
		587	if (dst > conns.size ())
		588	slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst);
542	else	589	else
543	{
544	// broadcast, first check router, then self, then english
545	connection *router = find_router ();
546
547	if (router)
548	router->inject_data_packet (pkt, true);	590	inject_data_packet (pkt, dst);
549	else
550	for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c)
551	if ((*c)->conf != THISNODE)
552	(*c)->inject_data_packet (pkt);
553	}
554	}	591	}
555		592
556	delete pkt;	593	delete pkt;
557	}
558	else if (revents & (POLLHUP \| POLLERR))
559	{
560	slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating."));
561	exit (1);
562	}	594	}
563	else	595	else
564	abort ();	596	abort ();
565	}	597	}
566		598
…		…
572	if (events & EVENT_SHUTDOWN)	604	if (events & EVENT_SHUTDOWN)
573	{	605	{
574	slog (L_INFO, _("preparing shutdown..."));	606	slog (L_INFO, _("preparing shutdown..."));
575		607
576	shutdown_all ();	608	shutdown_all ();
577
578	remove_pid (pidfilename);	609	remove_pid (conf.pidfilename);
579
580	slog (L_INFO, _("terminating"));	610	slog (L_INFO, _("terminating"));
581		611	exit (EXIT_SUCCESS);
582	exit (0);
583	}	612	}
584		613
585	if (events & EVENT_RECONNECT)	614	if (events & EVENT_RECONNECT)
586	{	615	{
587	slog (L_INFO, _("forced reconnect"));	616	slog (L_INFO, _("forced reconnect"));
…		…
589	reconnect_all ();	618	reconnect_all ();
590	}	619	}
591		620
592	events = 0;	621	events = 0;
593	}	622	}
594
595	w.at = TSTAMP_CANCEL;
596	}	623	}
597		624
598	void	625	void
599	vpn::shutdown_all ()	626	vpn::shutdown_all ()
600	{	627	{
…		…
613	connection_init ();	640	connection_init ();
614		641
615	for (configuration::node_vector::iterator i = conf.nodes.begin ();	642	for (configuration::node_vector::iterator i = conf.nodes.begin ();
616	i != conf.nodes.end (); ++i)	643	i != conf.nodes.end (); ++i)
617	{	644	{
618	connection *conn = new connection (this);	645	connection conn = new connection (this, i);
619
620	conn->conf = *i;
621	conns.push_back (conn);	646	conns.push_back (conn);
622
623	conn->establish_connection ();	647	conn->establish_connection ();
624	}	648	}
625	}	649	}
626		650
627	connection *vpn::find_router ()	651	connection *vpn::find_router ()
628	{	652	{
629	u32 prio = 0;	653	u32 prio = 1;
630	connection *router = 0;	654	connection *router = 0;
631		655
632	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	656	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
633	{	657	{
634	connection c = i;	658	connection c = i;
635		659
636	if (c->conf->routerprio > prio	660	if (c->conf->routerprio > prio
637	&& c->connectmode == conf_node::C_ALWAYS	661	&& c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use
638	&& c->conf != THISNODE
639	&& c->ictx && c->octx)	662	&& c->ictx && c->octx
		663	&& c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode
640	{	664	{
641	prio = c->conf->routerprio;	665	prio = c->conf->routerprio;
642	router = c;	666	router = c;
643	}	667	}
644	}	668	}
645		669
646	return router;	670	return router;
647	}	671	}
648		672
649	void vpn::connect_request (int id)	673	void vpn::send_connect_request (int id)
650	{	674	{
651	connection *c = find_router ();	675	connection *c = find_router ();
652		676
653	if (c)	677	if (c)
654	c->connect_request (id);	678	c->send_connect_request (id);
655	//else // does not work, because all others must connect to the same router	679	else
656	// // no router found, aggressively connect to all routers	680	// no router found, aggressively connect to all routers
657	// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)	681	for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i)
658	// if ((*i)->conf->routerprio)	682	if ((i)->conf->routerprio && (i)->conf != THISNODE)
659	// (*i)->establish_connection ();	683	(*i)->establish_connection ();
660	}	684	}
661		685
662	void	686	void
663	connection::dump_status ()	687	connection::dump_status ()
664	{	688	{
…		…
681		705
682	slog (L_NOTICE, _("END status dump"));	706	slog (L_NOTICE, _("END status dump"));
683	}	707	}
684		708
685	vpn::vpn (void)	709	vpn::vpn (void)
686	: event(this, &vpn::event_cb)	710	: event (this, &vpn::event_cb)
687	, udpv4_ev_watcher(this, &vpn::udpv4_ev)	711	, udpv4_ev_watcher (this, &vpn::udpv4_ev)
688	, ipv4_ev_watcher (this, &vpn::ipv4_ev)	712	, ipv4_ev_watcher (this, &vpn::ipv4_ev)
689	, tap_ev_watcher (this, &vpn::tap_ev)
690	#if ENABLE_TCP	713	#if ENABLE_TCP
691	, tcpv4_ev_watcher(this, &vpn::tcpv4_ev)	714	, tcpv4_ev_watcher (this, &vpn::tcpv4_ev)
692	#endif	715	#endif
		716	#if ENABLE_ICMP
		717	, icmpv4_ev_watcher(this, &vpn::icmpv4_ev)
		718	#endif
		719	#if ENABLE_DNS
		720	, dnsv4_ev_watcher (this, &vpn::dnsv4_ev)
		721	#endif
		722	, tap_ev_watcher (this, &vpn::tap_ev)
693	{	723	{
694	}	724	}
695		725
696	vpn::~vpn ()	726	vpn::~vpn ()
697	{	727	{

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Comparing gvpe/src/vpn.C (file contents): Revision 1.4 by pcg, Fri Apr 4 05:26:45 2003 UTC vs. Revision 1.31 by pcg, Sat Mar 5 19:13:16 2005 UTC

Diff Legend

Comparing gvpe/src/vpn.C (file contents):
Revision 1.4 by pcg, Fri Apr 4 05:26:45 2003 UTC vs.
Revision 1.31 by pcg, Sat Mar 5 19:13:16 2005 UTC